, Volume 20, Issue 6, pp 564–571 | Cite as

Response induced in prog motoneurons by glutamate application

  • N. I. Kalinina
  • G. G. Kurchavyi


It was shown during experiments on isolated frog brain (fromRanaridibunda) that response to microelectrophoretically injected glutamate on to various points on the somatodendritic motoneuronal membrane (GLU response) displayed the same properties as EPSP induced in the same motoneuron by activation of three different synaptic inputs. Techniques of transmembrane polarization and current chop by means of a single microelectrode were used in this research. Mean levels of reversal potentials of GLU response and EPSP occurring as a result of stimulating the reticular formation, dorsal root, and microstimulation of presynaptic elements at the point of glutamate application equaled −16.9 ± 1.7 (n=13), −6.8 ± 1.7 (n=13), −9.8 ± 1.8 (n=6), and −15.1 ± 1.4 mV (n=13), respectively. Summation of GLU response and EPSP were quasilinear. Changes (upwards) in conductance associated with GLU response did not exceed 10%. Findings would indicate that glutamate, acting on the postsynaptic membrane receptors, induces depolarization and may serve as transmitter in all three inputs investigated.


Glutamate Dorsal Root Membrane Receptor Synaptic Input Reticular Formation 


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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • N. I. Kalinina
  • G. G. Kurchavyi

There are no affiliations available

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